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Air bleeding pipe jointAir bleeding pipe joint description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060207656, Air bleeding pipe joint. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an air bleeding pipe joint connected to a circulation piping for engine cooling water and provided for executing an air bleeding within the circulation piping. [0003] 2. Description of Related Art [0004] When air is confined within the circulation piping at a time of injecting the engine cooling water within the circulation piping for the engine cooling water of a motor vehicle, an injecting performance of the engine cooling water is deteriorated. Accordingly, an air bleeding portion has been conventionally provided in the middle of the circulation piping. [0005] A technique that the air bleeding portion mentioned above is provided is disclosed, for example, in the following patent document 1. [0006] As a means for providing the circulation piping of the engine cooling water with the air bleeding portion mentioned above, the following patent document 2 discloses an air bleeding pipe joint that has a pair of connection pipe portions inserted and connected to the circulation piping, a branch pipe portion branched from the connection pipe portions and having an air bleeding hole in an inner side, and a plug body detachably mounted to the branch pipe portion so as to open and close the air bleeding hole, and discharges the air within the circulation piping to the outside by opening the air bleeding hole. The air bleeding pipe joint is provided on a circulation path of engine cooling water, that is, in the middle of the circulation piping. [0007] FIG. 13 shows a concrete example thereof. [0008] In the drawing, reference numeral 200 denotes a heater hose (a part of a piping for introducing cooling water heated by an engine to a heating heater core within a passenger room) constituting a part of the circulation piping of the engine cooling water, and reference numeral 202 denotes an air bleeding pipe joint connected to the heater hose 200. [0009] The air bleeding pipe joint 202 is formed in a T-shape as shown in FIG. 13(B), has a pair of connection pipe portions 204 and a branch pipe portion 206 branched therefrom, the connection pipe portions 204 are inserted and connected to a pair of heater hoses 200, and are further fixed by a hose clamp 208 (refer to FIG. 13(A)). [0010] The branch pipe portion 206 has an air bleeding hole 210 in the inner side thereof, and the air bleeding pipe joint 202 discharges the air within the circulation piping to the outside through the air bleeding hole 210. [0011] Reference numeral 212 denotes a plug body for opening and closing the air bleeding hole 210. The plug body 212 has a male thread portion 214, and the male thread portion 214 is screwed into a female thread portion 216 on the inner surface of the branch pipe portion 206, so that the plug body 212 is attached to the branch pipe portion 206. [0012] The plug body 212 has a large-diameter head portion 217, and the head portion 217 protrudes to an upper side in an axial direction and in an axially perpendicular direction from the branch pipe portion 206. [0013] The head portion 217 is formed in a hexagonal shape in a plan view as shown in FIG. 13(C), and has three pairs of tool engagement surfaces 220-1, 220-2 and 220-3 which are in parallel with each other along an outer periphery. [0014] In the structure shown in FIG. 13, the plug body 212 is attached to and detached from the branch pipe portion 206 by pinching the engagement surfaces 220-1, 220-2 and 220-3 from the axially perpendicular direction by a tool, such as a spanner or the like and rotating the tool. [0015] In this case, a cross-shaped groove 218 for engaging with the leading end of a screw driver is formed in a top surface of the head portion 217. [0016] In this case, in recent years, various parts and devices are in close formation within the engine room, and a space within the engine room is extremely limited. Accordingly, it is necessary to execute an attaching and detaching work of the plug body 212 in the air bleeding pipe joint 202 within the limited narrow working space. [0017] However, in the air bleeding pipe joint 202 shown in FIG. 13, it is necessary to rotate the plug body 212 while avoiding an interference with the other parts or the like within the narrow working space by using a long tool, and therefore, there is a problem that a workability is deteriorated. [0018] Further, if the plug body 212 is fastened too strongly by an excessive force with the tool, there is a risk that the thread or the head portion 217 is crushed or deformed, or a chip, a crack or the like is generated in the thread or the head portion 217, in some case. [0019] Further, in the case of the air bleeding pipe joint 202 shown in FIG. 13, if the joint is made of a resin, a play is generated in a thread fitting portion due to a long-term aging, so that there is a risk that a liquid leakage occurs therefrom, or the plug body 212 comes off. [0020] Further, it is required to make the air bleeding pipe joint as compact as possible, however, since the air bleeding pipe joint 202 shown in FIG. 13 is structured such that the plug body 212 protrudes in each of the axial direction and the axially perpendicular direction from the branch pipe portion 206, a branch length of an entire plug body 212 and branch pipe portion 206 is elongated, and the air bleeding pipe joint 202 itself becomes bulky, so that the air bleeding pipe joint 202 occupies a wide space within the engine room. [0021] Further, when executing other works in the periphery of the air bleeding pipe joint 202, the tool or the like is brought into contact or touch with the plug body 212. As a result, there is a risk that the plug body 212 is loosened or comes off, or the damage such as the chip, the crack or the like is generated in the plug body 212 by an impact. [0022] Further, in the case of the air bleeding pipe joint 202 shown in FIG. 13, there is a problem that it is troublesome to check whether or not the plug body 212 is completely closed. [0023] [Patent Document 1] Continue reading about Air bleeding pipe joint... Full patent description for Air bleeding pipe joint Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Air bleeding pipe joint patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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